Motor self-calibration control method

A motor self-calibration control method specifically comprises the steps that a proportional-integral observer estimates the actual synchronous estimated rotating speed and the estimated electrical angle of a permanent magnet synchronous motor according to a d-axis current feedback value, a q-axis current feedback value, q-axis reference voltage and d-axis reference voltage, and a position sensor detects the electrical angle of a motor rotor in real time; the electric angle of the rotor is obtained through automatic calibration and calculation of the position of the rotor and is input into vector control through an angle switching function for coordinate transformation calculation of Parker and inverse Parker, and closed-loop control over the permanent magnet synchronous motor is achieved. According to the invention, a proportional-integral observer, a rotor position automatic calibration function and an angle switching function are innovated, and a motor self-calibration control method is realized. According